CN203218893U - Device for solving potential induction attenuation - Google Patents
Device for solving potential induction attenuation Download PDFInfo
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- CN203218893U CN203218893U CN2013202129658U CN201320212965U CN203218893U CN 203218893 U CN203218893 U CN 203218893U CN 2013202129658 U CN2013202129658 U CN 2013202129658U CN 201320212965 U CN201320212965 U CN 201320212965U CN 203218893 U CN203218893 U CN 203218893U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The utility model provides a device for solving potential induction attenuation. During the day, a grid connected inverter in a photovoltaic system works normally, a second compensation device works too, the electric potential of an N line of an isolation transformer inverter side winding is raised, and a purpose of raising PV cathode potential to the ground is realized. When the grid connected inverter works, a potential difference between the N line potential on the isolation transformer inverter side winding and the PV cathode potential is decided by the grid connected inverter and is maintained within a certain difference range. At night, the photovoltaic system stops working, a first compensation device starts to work, through applying back voltage between the PV cathode and the ground, anti polarization processing is carried out, and the performance of a battery with PID attenuation can be restored. The back voltage can be positive voltage and can be negative voltage too, and is decided by the voltage of the PV cathode to the ground in actual conditions. When the voltage of the PV cathode to the ground is positive voltage, the back voltage of the first compensation device is negative voltage, otherwise the back voltage is positive voltage. The device can carry out compensation on potential attenuation generated by the PID during day and night.
Description
Technical field
The utility model relates to the photovoltaic power generation technology field, particularly a kind ofly solves the equipment that electromotive force is induced decay.
Background technology
Electromotive force induces decay (PID, Potential Induced Degradation) to refer to: because high pressure is applied on the cell panel and phenomenon that its performance is reduced over the ground.This high pressure may be positive voltage, also may be negative voltage, specifically is positive voltage or negative voltage, depends on the characteristic of cell panel.
The phenomenon that PID causes the cell panel performance to reduce is: open circuit voltage decline (Voc), breaking current (Isc) fill factor, curve factor (FF) be degradation down.
SUNPOWER company of the U.S. famous photovoltaic manufacturer finds, adopts backplane contact high-efficiency battery sheet A-300, specifically is to apply a high back voltage at assembly, and surperficial polarization phenomena take place.If apply positive voltage with respect to the earth at assembly, leakage current can flow to ground from battery immediately.The surface of battery can be along with the accumulated time negative electrical charge, and these electric charges can attract battery surface with positive charge, forms the complex centre.On the contrary, when applying negative voltage on the assembly, polarization phenomena are corresponding change also, and the performance of assembly can be not influential in this case.
In recent years, along with the continuous development of large-scale power station, mainly be the power station near the coastal area, these regional environmental conditions are more abominable, for example, high temperature, high humidity etc.Along with the prolongation of time, the PID problem is more and more serious.Solve the PID problem in the prior art and mainly adopt following method.
First kind, improve by material and technology to cell panel.
For example, to the insulating properties of assembly material, encapsulating material (glued membrane), the thin and thick in battery surface reflector etc., some assembly producer has tentatively solved this problem both at home and abroad at present.
But this method can cause cost to increase.
Second kind, inverter is handled.
For example, PV ground connection.
Because PV ground connection need increase the GFDI device, in addition, must consider that also earth point increases cost indirectly, and be not that every kind of product can be suitable for.
Therefore, how providing a kind of device, can solve the problem that performance that electromotive force induces decay to bring to assembly descends, is those skilled in the art's technical issues that need to address.
The utility model content
The technical problems to be solved in the utility model provides a kind of equipment that electromotive force is induced decay that solves, and can effectively prevent the assembly property decline problem that PID causes.
The invention provides a kind of equipment that electromotive force is induced decay that solves, be applied on the photovoltaic system, this photovoltaic system comprises photovoltaic PV assembly, combining inverter and isolating transformer, after the direct current process combining inverter inversion of PV assembly output is alternating current, feeds back to electrical network through isolating transformer again; This device comprises two compensation equipments, is respectively first compensation equipment and second compensation equipment;
First compensation equipment comprises: first input unit, first output unit and first voltage transformation module;
Second compensation equipment comprises: second input unit, second output unit and second voltage transformation module;
First input unit is used for from AC network side-draw electricity, and first voltage transformation module is used for the alternating current of power taking is carried out sending to first output unit after the conversion, and first output unit is used for the voltage after the conversion is fed back to the PV negative terminal;
Second input unit is used for from the AC network side-draw, second voltage transformation module is used for the alternating current of power taking is carried out sending to second output unit after the conversion, second output unit is used for the voltage after the conversion is fed back to the N line of isolating transformer inversion side, with the above earth potential of lifting N line voltage;
The first compensation equipment work in evening, second compensation equipment works by day.
Preferably,
Described first voltage transformation module comprises: an AC-DC and a DC-DC;
A described AC-DC sends to a described DC-DC after being used for the AC rectification that first input unit is got become direct current;
A described DC-DC is used for described direct current is carried out sending to first output unit after the direct voltage grade transformation;
Described second voltage transformation module comprises: the 2nd AC-DC and the 2nd DC-DC;
Described the 2nd AC-DC sends to described the 2nd DC-DC after being used for the AC rectification that second input unit is got become direct current;
Described the 2nd DC-DC is used for described direct current is carried out sending to second output unit after the direct voltage grade transformation.
Preferably, described photovoltaic system also comprises the Boost circuit, and described Boost circuit is connected between described PV assembly and the combining inverter.
Preferably, the input of described first input unit and the input of second input unit all are connected the input of isolating transformer, get alternating current from the source of isolating transformer.
Preferably, described first compensation equipment and second compensation equipment are same compensation equipment;
Also comprise first switch and second switch;
Described first switch is connected between the negative terminal of first output unit and PV assembly;
Between the N line of described second switch connection and first output unit and combining inverter;
During daytime, first switch disconnects, the second switch closure;
During evening, first switch closure, second switch disconnects.
The present invention also provides a kind of equipment that electromotive force is induced decay that solves, be applied on the photovoltaic system, this photovoltaic system comprises photovoltaic PV assembly, combining inverter and isolating transformer, after the direct current process combining inverter inversion of PV assembly output is alternating current, feed back to electrical network through isolating transformer again; This device comprises two compensation equipments, is respectively first compensation equipment and second compensation equipment;
First compensation equipment comprises: first input unit, first output unit and first voltage transformation module;
Second compensation equipment comprises: second input unit, second output unit and second voltage transformation module;
First input unit is used for from the DC side power taking, and first voltage transformation module is used for the direct current of power taking is carried out sending to first output unit after the conversion, and first output unit is used for the voltage after the conversion is fed back to the PV negative terminal;
Second input unit is used for from the DC side power taking, second voltage transformation module is used for the direct current of power taking is carried out sending to second output unit after the conversion, second output unit is used for the voltage after the conversion is fed back to the N line of isolating transformer inversion side, with the above earth potential of lifting N line voltage;
The first compensation equipment work in evening, second compensation equipment works by day.
Preferably, described first voltage transformation module comprises: a DC-DC;
A described DC-DC is used for described direct current is carried out sending to first output unit after the direct voltage grade transformation;
Described second voltage transformation module comprises: the 2nd DC-DC;
Described the 2nd DC-DC is used for described direct current is carried out sending to second output unit after the direct voltage grade transformation.
Preferably, described photovoltaic system also comprises the Boost circuit, and described Boost circuit is connected between described PV assembly and the combining inverter;
The input of described first input unit and the input of second input unit all are connected the outlet side of Boost circuit.
Preferably, described first compensation equipment and second compensation equipment are same compensation equipment;
Also comprise first switch and second switch;
Described first switch is connected between the negative terminal of first output unit and PV assembly;
Between the N line of described second switch connection and first output unit and combining inverter;
During daytime, first switch disconnects, the second switch closure;
During evening, first switch closure, second switch disconnects.
Compared with prior art, the utlity model has following advantage:
The equipment that the utility model provides, during daytime, the combining inverter operate as normal in the photovoltaic system, second compensation equipment 200 is also worked, current potential on like this can the N line of lifting isolating transformer inversion side winding is realized the purpose of lifting PV negative pole above earth potential indirectly.Because during combining inverter 300 work, the N line current potential of isolating transformer 400 inversion side windings and the potential difference of PV negative pole are determined by combining inverter 300, maintain in certain difference range.During evening, photovoltaic system quits work, and first compensation equipment 100 is started working, and by applying back-pressure between and the ground negative to PV, carries out contrapolarization and handles, and the battery performance of PID decay is restored.Need to prove that this back-pressure can also can be negative pressure for malleation, concrete condition is looked the negative voltage over the ground of PV and is decided.When the negative voltage over the ground of PV was malleation, the back-pressure that first compensation equipment 100 applies was negative pressure, otherwise is malleation.Therefore, the equipment that the utility model provides can all can compensate the electromotive force decay that PID produces with evening by day.
Description of drawings
Fig. 1 is apparatus embodiments one schematic diagram that solution electromotive force that the utility model provides is induced decay;
Fig. 2 a is the first voltage transformation module schematic diagram that the utility model provides;
Fig. 2 b is the second voltage transformation module schematic diagram that the utility model provides;
Fig. 3 is apparatus embodiments two schematic diagrames that solution electromotive force that the utility model provides is induced decay;
Fig. 4 is apparatus embodiments three schematic diagrames that solution electromotive force that the utility model provides is induced decay;
Fig. 5 is apparatus embodiments four schematic diagrames that solution electromotive force that the utility model provides is induced decay.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
Referring to Fig. 1, this figure is apparatus embodiments one schematic diagram that solution electromotive force that the utility model provides is induced decay.
Present embodiment provides a kind of equipment that electromotive force is induced decay that solves, be applied on the photovoltaic system, this photovoltaic system comprises photovoltaic PV assembly, combining inverter 300 and isolating transformer 400, after direct current process combining inverter 300 inversions of PV assembly output are alternating current, feed back to electrical network through isolating transformer 400 again; This device comprises two compensation equipments, is respectively first compensation equipment 100 and second compensation equipment 200;
The work in 100 evenings of first compensation equipment, second compensation equipment 200 works by day.
The equipment that the utility model provides, during daytime, the combining inverter operate as normal in the photovoltaic system, second compensation equipment 200 is also worked, current potential on like this can the N line of lifting isolating transformer inversion side winding is realized the purpose of lifting PV negative pole above earth potential indirectly.Because during combining inverter 300 work, the N line current potential of isolating transformer 400 inversion side windings and the potential difference of PV negative pole are determined by combining inverter 300, maintain in certain difference range.During evening, photovoltaic system quits work, and first compensation equipment 100 is started working, and by applying back-pressure between and the ground negative to PV, carries out contrapolarization and handles, and the battery performance of PID decay is restored.Need to prove that this back-pressure can also can be negative pressure for malleation, concrete condition is looked the negative voltage over the ground of PV and is decided.When the negative voltage over the ground of PV was malleation, the back-pressure that first compensation equipment 100 applies was negative pressure, otherwise is malleation.Therefore, the equipment that the utility model provides can all can compensate the electromotive force decay that PID produces with evening by day.
Need to prove that among the embodiment shown in Figure 1, can also comprise the Boost circuit, this Boost circuit 500 is connected between PV assembly and the combining inverter 300.
The input of described first input unit 101 and the input of second input unit 201 all are connected the input of isolating transformer 400, get alternating current from the source of isolating transformer 400.For three-phase system, both can be from the phase voltage power taking, also can be from the power taking of line voltage.Be specially: when isolating transformer 400 source band N lines, both can be from the power taking of line voltage, also can be from the phase voltage power taking; When isolating transformer 400 sources are not with the N line, from the power taking of line voltage.
Referring to Fig. 2 a, this figure is the first voltage transformation module schematic diagram that the utility model provides.
In the present embodiment, described first voltage transformation module comprises: an AC-DC102a and a DC-DC102b;
A described AC-DC102a sends to a described DC-DC102b after being used for the AC rectification that first input unit is got become direct current;
A described DC-DC102b is used for described direct current is carried out sending to first output unit after the direct voltage grade transformation;
Referring to Fig. 2 a, this figure is the second voltage transformation module schematic diagram that the utility model provides.
Described second voltage transformation module comprises: the 2nd AC-DC202a and the 2nd DC-DC202b;
Described the 2nd AC-DC202a sends to described the 2nd DC-DC202b after being used for the AC rectification that second input unit is got become direct current;
Described the 2nd DC-DC202b is used for described direct current is carried out sending to second output unit after the direct voltage grade transformation.
Need to prove that first compensation equipment and second compensation equipment can be same equipment, namely the structure of both inside can be identical, introduces the specific implementation of this embodiment below in conjunction with accompanying drawing.
Referring to Fig. 3, this figure is apparatus embodiments two schematic diagrames that solution electromotive force that the utility model provides is induced decay.
In the present embodiment, described first compensation equipment and second compensation equipment are same compensation equipment; Be that example is introduced with first compensation equipment.
Also comprise first switch S 1 and second switch S2;
Described first switch S 1 is connected between the negative terminal of first output unit 101 and PV assembly;
Between the N line of described second switch S2 connection and first output unit 101 and combining inverter 400;
During daytime, first switch S 1 disconnects second switch S2 closure;
During evening, first switch S, 1 closure, second switch S2 disconnects.
The equipment that present embodiment provides can share same set of equipment with first compensation equipment and second compensation equipment, can save cost like this, and only just can control daytime and evening by two switches the time, gives different compensation.During daytime, S1 disconnects, and the S2 closure feeds back to voltage on the N line of isolating transformer input.During evening, the S1 closure, S2 disconnects, and voltage is fed back to the PV negative terminal.
The equipment that above embodiment provides is from exchanging the side-draw electricity, introducing the embodiment from the DC side power taking below.
Referring to Fig. 4, this figure is apparatus embodiments three schematic diagrames that solution electromotive force that the utility model provides is induced decay.
The solution electromotive force that present embodiment provides is induced the equipment of decay, be applied on the photovoltaic system, this photovoltaic system comprises photovoltaic PV assembly, combining inverter 300 and isolating transformer 400, after direct current process combining inverter 300 inversions of PV assembly output are alternating current, feed back to electrical network through isolating transformer 400 again; This device comprises two compensation equipments, is respectively first compensation equipment 100 and second compensation equipment 200;
The work in 100 evenings of first compensation equipment, second compensation equipment 200 works by day.
As shown in the figure, during from the DC side power taking, refer to and get all or part of of voltage between A point and the B point.
The equipment that the utility model provides, during daytime, the combining inverter operate as normal in the photovoltaic system, second compensation equipment 200 is also worked, current potential on like this can the N line of lifting isolating transformer inversion side winding is realized the purpose of lifting PV negative pole above earth potential indirectly.Because during combining inverter 300 work, the N line current potential of isolating transformer 400 inversion side windings and the potential difference of PV negative pole are determined by combining inverter 300, maintain in certain difference range.During evening, photovoltaic system quits work, and first compensation equipment 100 is started working, and by applying back-pressure between and the ground negative to PV, carries out contrapolarization and handles, and the battery performance of PID decay is restored.Need to prove that this back-pressure can also can be negative pressure for malleation, concrete condition is looked the negative voltage over the ground of PV and is decided.When the negative voltage over the ground of PV was malleation, the back-pressure that first compensation equipment 100 applies was negative pressure, otherwise is malleation.Therefore, the equipment that the utility model provides can all can compensate the electromotive force decay that PID produces with evening by day.
Described photovoltaic system also comprises the Boost circuit, and described Boost circuit is connected between described PV assembly and the combining inverter;
The input of described first input unit and the input of second input unit all are connected the outlet side of Boost circuit.
Referring to Fig. 5, this figure is apparatus embodiments four schematic diagrames that solution electromotive force that the utility model provides is induced decay.
In the present embodiment, described first voltage transformation module comprises: a DC-DC102a;
A described DC-DC102a is used for described direct current is carried out sending to first output unit after the direct voltage grade transformation;
Described second voltage transformation module comprises: the 2nd DC-DC202a;
Described the 2nd DC-DC202a is used for described direct current is carried out sending to second output unit after the direct voltage grade transformation.
The equipment similar with embodiment shown in Figure 3, that present embodiment provides, during from the DC side power taking, first compensation equipment and second compensation equipment also can be same equipment, namely share.
Described first compensation equipment and second compensation equipment are same compensation equipment;
Also comprise first switch S 1 and second switch S2;
Described first switch S 1 is connected between the negative terminal of first output unit 103 and PV assembly;
Between the N line of described second switch S2 connection and first output unit 103 and combining inverter;
During daytime, first switch S 1 disconnects second switch S2 closure;
During evening, first switch S, 1 closure, second switch S2 disconnects.
Need to prove that the S1 among Fig. 3 and S2 can be switch elements such as relay, contactor, metal-oxide-semiconductor or IGBT.
The above only is preferred embodiment of the present utility model, is not the utility model is done any pro forma restriction.Though the utility model discloses as above with preferred embodiment, yet is not in order to limit the utility model.Any those of ordinary skill in the art, do not breaking away under the technical solutions of the utility model scope situation, all can utilize method and the technology contents of above-mentioned announcement that technical solutions of the utility model are made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solutions of the utility model according to any simple modification, equivalent variations and the modification that technical spirit of the present utility model is done above embodiment, all still belongs in the scope of technical solutions of the utility model protection.
Claims (9)
1. one kind solves the equipment that electromotive force is induced decay, be applied on the photovoltaic system, this photovoltaic system comprises photovoltaic PV assembly, combining inverter and isolating transformer, after the direct current process combining inverter inversion of PV assembly output is alternating current, feeds back to electrical network through isolating transformer again; It is characterized in that this device comprises two compensation equipments, is respectively first compensation equipment and second compensation equipment;
First compensation equipment comprises: first input unit, first output unit and first voltage transformation module;
Second compensation equipment comprises: second input unit, second output unit and second voltage transformation module;
First input unit is used for from AC network side-draw electricity, and first voltage transformation module is used for the alternating current of power taking is carried out sending to first output unit after the conversion, and first output unit is used for the voltage after the conversion is fed back to the PV negative terminal;
Second input unit is used for from the AC network side-draw, second voltage transformation module is used for the alternating current of power taking is carried out sending to second output unit after the conversion, second output unit is used for the voltage after the conversion is fed back to the N line of isolating transformer inversion side, with the above earth potential of lifting N line voltage;
The first compensation equipment work in evening, second compensation equipment works by day.
2. solution electromotive force according to claim 1 is induced the equipment of decay, it is characterized in that,
Described first voltage transformation module comprises: an AC-DC and a DC-DC;
A described AC-DC sends to a described DC-DC after being used for the AC rectification that first input unit is got become direct current;
A described DC-DC is used for described direct current is carried out sending to first output unit after the direct voltage grade transformation;
Described second voltage transformation module comprises: the 2nd AC-DC and the 2nd DC-DC;
Described the 2nd AC-DC sends to described the 2nd DC-DC after being used for the AC rectification that second input unit is got become direct current;
Described the 2nd DC-DC is used for described direct current is carried out sending to second output unit after the direct voltage grade transformation.
3. solution electromotive force according to claim 1 and 2 is induced the equipment of decay, it is characterized in that, described photovoltaic system also comprises the Boost circuit, and described Boost circuit is connected between described PV assembly and the combining inverter.
4. solution electromotive force according to claim 1 and 2 is induced the equipment of decay, it is characterized in that, the input of described first input unit and the input of second input unit all are connected the input of isolating transformer, get alternating current from the source of isolating transformer.
5. solution electromotive force according to claim 1 and 2 is induced the equipment of decay, it is characterized in that, described first compensation equipment and second compensation equipment are same compensation equipment;
Also comprise first switch and second switch;
Described first switch is connected between the negative terminal of first output unit and PV assembly;
Between the N line of described second switch connection and first output unit and combining inverter;
During daytime, first switch disconnects, the second switch closure;
During evening, first switch closure, second switch disconnects.
6. one kind solves the equipment that electromotive force is induced decay, be applied on the photovoltaic system, this photovoltaic system comprises photovoltaic PV assembly, combining inverter and isolating transformer, after the direct current process combining inverter inversion of PV assembly output is alternating current, feeds back to electrical network through isolating transformer again; It is characterized in that this device comprises two compensation equipments, is respectively first compensation equipment and second compensation equipment;
First compensation equipment comprises: first input unit, first output unit and first voltage transformation module;
Second compensation equipment comprises: second input unit, second output unit and second voltage transformation module;
First input unit is used for from the DC side power taking, and first voltage transformation module is used for the direct current of power taking is carried out sending to first output unit after the conversion, and first output unit is used for the voltage after the conversion is fed back to the PV negative terminal;
Second input unit is used for from the DC side power taking, second voltage transformation module is used for the direct current of power taking is carried out sending to second output unit after the conversion, second output unit is used for the voltage after the conversion is fed back to the N line of isolating transformer inversion side, with the above earth potential of lifting N line voltage;
The first compensation equipment work in evening, second compensation equipment works by day.
7. induce the equipment of decay according to right 6 described solution electromotive forces, it is characterized in that described first voltage transformation module comprises: a DC-DC;
A described DC-DC is used for described direct current is carried out sending to first output unit after the direct voltage grade transformation;
Described second voltage transformation module comprises: the 2nd DC-DC;
Described the 2nd DC-DC is used for described direct current is carried out sending to second output unit after the direct voltage grade transformation.
8. induce the equipment of decay according to right 6 or 7 described solution electromotive forces, it is characterized in that it is characterized in that, described photovoltaic system also comprises the Boost circuit, described Boost circuit is connected between described PV assembly and the combining inverter;
The input of described first input unit and the input of second input unit all are connected the outlet side of Boost circuit.
9. induce the equipment of decay according to right 6 or 7 described solution electromotive forces, it is characterized in that it is characterized in that, described first compensation equipment and second compensation equipment are same compensation equipment;
Also comprise first switch and second switch;
Described first switch is connected between the negative terminal of first output unit and PV assembly;
Between the N line of described second switch connection and first output unit and combining inverter;
During daytime, first switch disconnects, the second switch closure;
During evening, first switch closure, second switch disconnects.
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2013
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